Spark plug gap


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By kidcourier - 17 Years Ago
Hi Guys,  Also newbie to Y-blocks and just learned about setting timing to 8-10 degrees insted of stock 3 degrees,thanks ! My question is I'm running a 272 c. i. with mild cam,headers,alum.manifold (4 barrel),500 cfm carb.,MSD dist.,I bought a set of Autolite 45's, do I set gap .028 stock or change the gap (running 4-speed)? Skip
By pegleg - 17 Years Ago
Skip,

   If you have a decent coil, and larger wires, try opening the gap to .035" the try .045". The larger gap will give a better chance to ignite the mixture, if the ignition is up to the task. Newer cars can run .060". I can get away with .045' and my blower, no problem   

By kidcourier - 17 Years Ago
Thanks Frank,  Got the MSD coil and Streetfire wires,set the gap at .040 and she fired right up! Have to reset the timing to 8 or 10 degrees and dial in the carb a little and then ride boldly ride! Oh! Is that near Goshen or Southbend? And is the St. Joseph river still brown ? (Elkhart brat transplanted to Left Coast-- LOL)  Skip
By DANIEL TINDER - 17 Years Ago
Sam,



Wider POINT gap = retarded timing. Wide PLUG gap = easier starting, but risks high rpm missing (from what I've read).
By pegleg - 17 Years Ago
Dan,

        The newer stronger coils will fire .060 pretty easily. My MSD doesn't misfire at 6500 with 6 or 7 lbs of boost and 045" gap. As far as the timing, I'd be amazed if you could see the difference, although it's there, with a timing light. It has to require an extra nano-second to build up a little extra amperage. 

     Courier, Bristol is about ten miles East of Elkhart, right on 80/90. North of Goshen about ten miles. And , this time of year, the beatiful Elkhart river is very high, and very brown.